Packing material for hot-rivet joints.



,PATENTE'D AUG, -11, 1903.

. L. LAKEBERG.

MATERIAL FOR HOT RIVET JOINTS.

PACKING APPLICATION TILED JULY 5, 1902 no uonnn.

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UNITED STATES Patented August 11, 1903.

PATENT ()FFICE.

LEOPOLD LAKEBERe, OF LEHE, GERMANY.

PACKING MATERIAL FOR HOT-RIVET JOINTS.

SPECIFICATION forming part of Letters Patent No. 735,782, dated August 11, 1903. Application filed July 5, 1902. Serial No. 114,527. (No model.)

Obtained by Hot-Riveting, of which the fol lowing is a specification.

In the accompanying drawings the packing material is shown in Figure 1in a perspective view. Fig. 2 is a cross-section showing the rivetedjoints with the packing material applied. 1

This invention relates to a packing material which is advantageouslyused in jointing metal parts by means of hot-riveting.

The packing material consists of a sheet of pasteboard to both surfacesof which wire nettings are fixed in any suitable manner. Thewire-nettings are either pressedinto the readypasteboard or they can beconnected with the pasteboard while being manufactured. Thewire-nettings on both sides of the pasteboard are filled with lac orvarnish which is of such a kind that it becomes liquid when verystrongly heated-for example, to several hundred degrees-and hardensquickly and strongly at the usual temperature.

The packing is used in the following manner: Before the joint is rivetedthe packing material is placed between the metal parts which are to bejointed. The rivet-holes are eventually to be made in the packing material before it is placed in position. WVhen the red-hot clench-bolt isinserted, the lac or varnish which fills'the wire-netting becomes liquidimmediately around the riveting-hole and up to a certain distance aroundthe same,

and under the pressure with which the metal 40 parts are pressedtogether by-the rivet the liquid lac fiow's into the small spaces whichare nearly always left free around the rivet, as the rivetingholes ofthe two parts are very rarely placed exactly over each other, theclench-bolt consequently deviating from its vertical position. The lachardens simultaneously with the clench-bolt and the surrounding metal,thus forming a hard mass tightly filling out any holes or free spaces inthe rivet, preventing the passing of cold water, even if the same isunder a certain pressure.

This improved packing material is not intended to be used with objectswhich become hot in their, use-as boilers, for example. The purpose ofthe packing is principally to calk against cold pressure. It willtherefore be used most in shipbuilding.

Having fully described my invention, what I claim, and desire to secureby Letters Pat-. out, is-

Packing material for hot-rivet joints consisting of pasteboard,wire-nettings fixed on both surfaces of said pasteboard and acoating oflac or varnish melting at a high temperature on the Wire-nettings tofill the space around the clench-bolt, substantially as described andshown and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

LEOPOLD LAKEBERG.

Vitnesses:v

FR. v. LEZZENN,

E. HiiLsEBnRe.

